Use the result from an intitial check to find if the target volume
has an EFI system partition, later on in the installation process
before checking for previous Chameleon installations. Add some
feedback to the installer log.

Enhanced installer
- We can add an option without an associated package
- We can have an option that install multiple packages
- No more "fake" option (none)
- The package that is build is already compressed (no need to
compress
it again)